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4.3.16
* Fix example code for `every`
* Improved documentation for `ListT`
4.3.15
* Build against `ghc-9.0`
4.3.14
* Add `mapMaybe` and `wither`, and more laws for `filter` and `filterM`.
4.3.13
* Add `MonadFail` instance for `Proxy`
4.3.12
* Fix space leak introduced in version 4.3.10
* This leak primarily affects the use of `forever`
4.3.11
* Fix documentation for `scanM`
4.3.10
* Relax `Monad` constraints to `Functor`
* Support GHC 8.8
4.3.9
* Increase upper bound on `exceptions`
4.3.8
* Increase upper bound on `exceptions`
4.3.7
* Documentation fix
4.3.6
* Fix implementation of `pass` in `MonadWriter` instance for `Proxy`
4.3.5
* Support `Semigroup` being a super-class of `Monoid`
4.3.4
* Increase upper bound on `mmorph`
4.3.3
* Make `X` a synonym for `Data.Void.Void`
4.3.2
* BUG FIX: Fix `MMonad` instance for `ListT`
* The old instance was an infinite loop
4.3.1
* Support building against `ghc-7.4`
4.3.0
* BREAKING CHANGE: Remove `Alternative`/`MonadPlus` instances for `Proxy`
* See commit 08e7302f43dbf2a40bd367c5ee73ee3367e17768 which explains why
* Add `Traversable` instance for `ListT`
* New `MonadThrow`/`MonadCatch`/`MMonad`/`Semigroup`/`MonadZip` instances for
`ListT`
* New `MonadThrow`/`MonadCatch` instances for `Proxy`
* Fix lower bound on `mtl`
* Increase upper bound on `optparse-applicative`
4.2.0
* BREAKING CHANGE: Switch from `ErrorT` to `ExceptT`
* Add `Foldable` instance for `ListT`
* Fix all warnings
* Enable foldr/build fusion for `toList`
4.1.9
* Increase lower bound on `criterion`
* Increase upper bound on `transformers` for tests/benchmarks
* Optimize code by delaying `INLINABLE` annotations
4.1.8
* Increase upper bound on `transformers`
* Prepare for MRP (Monad of no Return Proposal)
4.1.7
* Increase lower bound on `deepseq`
* Add `unfoldr`
* Add `loop`
* Add `toListM'`
* Improve efficiency of `drop`
* License tutorial under Creative Commons license
4.1.6
* Increase lower bound on `base`
* Add diagrams to `Pipes.Core` documentation
* Add `mapM_`
* Add `takeWhile'`
* Add `seq`
* Improve efficiency of `toListM`
4.1.5
* Increase upper bound on `criterion`
4.1.4
* Increase upper bound on `criterion`
* Add `Monoid` instance for `Proxy`
4.1.3
* Increase lower bound on `mtl`
* Re-export `void`
* Add `fold'`
* Add `foldM'`
4.1.2
* Increase upper bounds on `transformers` and `mtl`
4.1.1
* Add `runListT`
* Add `MMonad` instance for `Proxy`
* Add `repeatM`
* Add laws to documentation of `Pipes.Prelude` utilities
4.1.0
* Remove Haskell98 support
* Use internal `X` type instead of `Data.Void`
* Document `Pipes.Lift` module:w
* Add `drain`
* Add `sequence`
4.0.2
* Improve performance of `each`
* Add tutorial appendix explaining how to work around quadratic time complexity
4.0.1
* Remove `WriterT` and `RWST` benchmarks
* Add `Enumerable` instance for `ErrorT`
* Add cabal flag for Haskell98 compilation
* Add several rewrite rules
* Add `mtl` instances for `ListT`
* Fix implementation of `pass`, which did not satisfy `Writer` laws
* Implement `fail` for `ListT`
* Add type synonym table to tutorial appendix
* Add QuickCheck tests for `pipes` laws
* Add `mapFoldable`
* Add `Monoid` instance for `ListT`
* Add manual proofs of `pipes` laws in `laws.md`
4.0.0
Major upgrade of `pipes` to no longer use `Proxy` type class
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